Thanks for writing to H.C.M. for your query.
I have gone through your query regarding hurt in your ear in yawing or burp, though you have grommets in ear drum on both side about three months back. Considering your complaints it appears either your grommets are blocked or middle ear gets infected and infection may reach there from throat or from ear canal
via grommet. Beside this there are some other situation when your ear remain O.K. but pain is being referred from diseases of other structures like-
(1) Pathology of last molar tooth
(2) Lesions of posterior part of tongue.
(3) Infections of tonsil
(4) Blocked Eustachian tube
(5) Temporomandibular joint pain.
Diseases of above listed structure refer the pain to ear therefore thorough examination of all above along with ear in necessary to find out the real fact which accordingly can be manage.